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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769e7b8615bc54742a88c084099d999b7e0621f5e9db8534a0487275abc275ad' 
  AND token = 'hX5hynjsO7on9fxCh2zCmFBcg6bHGKMTqi9r6BBqNNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}