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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1112ef1c6c7bc0d6d32740266741307438c196643a747598043166063b0ce2f7' 
  AND token = 'iV8gPgeoxHIsaOd0lXSgCseznBtXeUlYBTpbintsVsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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