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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a84ce9f42f6a0e686f463f3f33d8ae49b15f1c695b9d23e6322147ccd651b5' 
  AND token = '7kKZo1pKMJUotUBntdNLxOtJbOqc7G0I1A/0yIyDVKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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