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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ba088e7b39fac1897e05586aa2609c0e91b9c335060a4a4df386bca7af1609' 
  AND token = 'LJzlt/BM40sO63bcam2Kl1BJcH7SJeW4BZQnlqb0fdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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