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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2803a0d94efe434f00f2a946c2c2295eaeeaf21dfad8668a582c4e47298a20a' 
  AND token = 'eJwS+d5xgm/J6x275OChhKYZhEKgVZGL/gXxhU9Oz7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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