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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f499670fc6624d034761cb4eeb47eaabe411893e632bda58cc83047ccff9ac5d' 
  AND token = 'lDbr5G1FyRGEJ5jU0Sr7yRQXDu0h4kYrVYsZAWu6JSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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