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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7fd9595dc211d20d4817d1a31bf748b426cee5d6b9c5b89468c77a52a9097f' 
  AND token = 'cnvKwxMK3PCKE38E/oZeAiB/E45wOEyWZRQK9MYzrrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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