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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b2786e04aaf1b038df5e645bf0cdd985eeb7a31e7142a975a20a716c871785' 
  AND token = '2auD+hold3fUDcolZ4XmUHJ3uKJw0kXSjDAYWy/404E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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