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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e70d2fbce3994de016b610ebba76b8ef375c2a04a4c31663dfb81d65fc60445' 
  AND token = 'LF97lZcYPys7EXspa8tBA+K0f5BNVVaaMLQfQdo03XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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