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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98eea24ada268d63f9be0f584b2f72a547f8ab1a5edf4b9e2d38d1635e881312' 
  AND token = 'Y8BFea7xhU8Bx6guWtXsISt8sLvTWazCgVzG7X0IlE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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