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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51cd980499b5f138db881186fd9c0322d0ccd1658fc4fc07432d4776db58fa7f' 
  AND token = 'zcFYqCuplM0iiQ1UE7jeTBrU/o3Hcp+BJE0jJDYuUL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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