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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ab862e78992d89d58eb6ee6126c772afd249f6d9de07b3dcf37d77940d34a8' 
  AND token = 'gx5ZGgIhCsqMH8xHm1haOK1H04+O0hgyD01w34elhU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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