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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f1cc5ca522649d10216a35c29b63492334ed3307d5e0f17174c1905d620e2d' 
  AND token = 'VNMa5J7o7Sx+/+9BvjrlIBB0lzqe/QCOr7E7GeOPBaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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