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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0c29fc22c723bc6a3d5b8cacd03f4e1bc1508eb6e7da7dfecf274964099396' 
  AND token = 'mhDj6UHm2CU7U9Jm1V+aNpA1h8WRotBzPXwUfp3qORE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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