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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29af9e562bd4886b530278e58be20771554ea39d7ea8e2b76d699e76cf402508' 
  AND token = 'IHAolQKRVFejpMsAUrYi22e4KqYPpeGH/ikqobVQa/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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