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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb60050e763a9447db7b948e79de34973f45698ce6e77e81f640d3078a9ad2c' 
  AND token = 'DxNmYDG4HsLWMWGYY1Ky22PJMb2Wduo/zKZ5VdZPR/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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