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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57b217b19a87ea7b95887d506166a67fb6900a865a39aac4a2faf497a9b4aea1' 
  AND token = 'Er2Y7KS1qIfonl2cqt2nfi3sSWCbiCPgeZXRXXEMI+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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