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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0b76d9c65b0f2651a8d88a74338293b77a1a6cb986d30a70654d7513ef1aed' 
  AND token = 'DLn9nREQofo4a5R7Lv1Ybp/RTQcUfEOZuje6UxZkk2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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