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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e0b0c8f254883a6ae9fa2f1083ac48d9ef3dd86cfbba63c815b9ab6c0573a3' 
  AND token = 'OxlnlKs8lUcDrRIqRQ47tpT4CWDlaiUClg8grXLe8uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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