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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed576b5341df1a5459a015100acb842f3b818ab7c0cb1206bc929653e6b06343' 
  AND token = 'cBAyc3K3NKyxhIzpBKIAf4yhocAYJp5ryYq2l77ivUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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