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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05588c899bea7e6dc7fe7a11b700277d680914e8ba067d5956da6f26c2d616d2' 
  AND token = 'aIUF1qhJuqpvAXVdGr79rJg+aU8Xc/kGje1ROOpBEWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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