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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44ec5c0d9cfd4a52aa9e664a0e03874ff262bf983ef8c38417a329b21b994de' 
  AND token = 'x+6X4VBho7tYTr+LADSl3VitZ2EuOtJSxP8BqG95ads=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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