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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a56674828c7a8482023de80a8d5287693fd9ff69770504cc021a985059e3471' 
  AND token = 'KRs7xqN6C3AgSIWcFb8B7AR4Mol3QVSYYptbmgC2spY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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