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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284032b978ccb540906b1a5e25272fc1eada7c26d2ffb391c2442afab3e4a948' 
  AND token = 'AuqVWVCpBMfW28T9+S1byf/7UMePcY0g9JjAexY9S6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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