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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8af39eeec6e1a1efee378f6ceb8fbc4f5bdea67ff314e6c0eb2172560ad8fa3' 
  AND token = 'lXsmtRSo9oxm1pSGzwCSOmmLwmyH1LBPa/wWmcKp2MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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