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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820adf6a41f0d580c5121a8c41803b0892a4641360759cc1d8983b3d128a0062' 
  AND token = '7jfjE83WUVX+zsFIvfK3vXYcanHXgbLuWe39uIePu1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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