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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb48250ac0b687d6cd495a12916276d481c4e3f3dd56e887cdf3ff93f3ca735b' 
  AND token = 'bWZ8xZZA6iHoT+dm9/PNZl3WjWdtZi1nsdFCEieRB7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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