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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c74f5622c880d5b902dcef7fb65b37ee518627755c62be1fbf107c7b79062de' 
  AND token = 'bLaS+aL1Xr3obWZQq9ynfq7Mh2Vn77ImOge5wAks6o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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