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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05de74f359faf2572d8861250c9a7c8ac431feac46bb837db0777cd21559d57' 
  AND token = 'lI9ZuDLyPHw9T4Pk4d9Ll1HKpXyAOd47vFbgq8imID8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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