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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c53ab0ea7c2444e2e7d6e579bbe1b4e215823b14849e37d16d3cb6afbb97916' 
  AND token = '87L4W672Pl8X6z8sd3sloC/p3UWvSqkdosV33njEw94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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