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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5a41d4f0f50cf7db9a2deffb18131bfb16ce2bcd6cef9a637e3ec6bebeb2f4' 
  AND token = 'ewxsGpODrW0pxXCuXHMQkfP8lOuzAf60KCCm5Gk78sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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