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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787736019df7c2181b546d55f10a705db1eefa75620d2ef9fe5312382ba91707' 
  AND token = '1FzbCAH5dcVay4JIgKorJQQhcpTdCiHxhmjJ68mTr+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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