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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e95d4d60b7598e0a1f4ec10104dad502ec324da5dcb5aed86a8b2ca72e6f536' 
  AND token = '9oDW6U74Rk9R/LUQrKq/QNtBIPHWxHwzjqqvhNDk40M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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