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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995ebb34fe090bbbeb9e68f81c2d90b573a92e9a785f462600346d5e90ebd7ec' 
  AND token = 'aNrzuRfI5DryN1nMlv+RE2NSkB5gUiaTEfKei0EadSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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