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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c8f7b71f038d3e9e83d2e9f59da0c1b4b454f27b89d9a25c05dd0703e0988a' 
  AND token = 'ZdacUpqfAPm+0C1gaHmy0w0XHqTGmIrUVwXHVAa8r30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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