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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dc9df7a44cd80116f38ccf9f7b981b6de9ba6c473ea9c5299fd94fd269c46a' 
  AND token = 'yR1+lw+JHsJEccUYbBAUpppXhUdIV72OoaYxOt0I4bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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