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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7716d5f8942c8c1d5364f369653abfbf1f2761dffc7c91962b6c23ff7e146e8' 
  AND token = 'kzHpDOwizIG2MwvYvT6tcDTpYQccHHYRvkft5HeH1N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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