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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b477da5cf1ca26a512e37a48464f297d66e4fcfda377d44c07d5ffe51971744' 
  AND token = '0kCIi6d4oiFkzbqTGsZAqi032DWrDW41ig4juNnZ2EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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