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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3de2dddd31ca1154e5c8fed3c5aa470522bc2db8b717bb17c81602a419409b' 
  AND token = 'VaNH7Jmqqi52O+I265K/OQcDj/jXGAFfcDNOZoTThRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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