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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020b19c6cbe83540113e035e8651647a21e47d544264605ffcb55ce8615e85bf' 
  AND token = 'XWChc+r2c9c6PNXJAe3WVXa0dZKLkX+hBA6HV2XE1h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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