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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596d6ed1ab717d451aba3af9a299f20e11989d5cde7a36c25ae27acbf016b9ad' 
  AND token = 'xTBdNsE1LFCK2Om5OOWO5EN42gkYYML1/M1YxUlkSTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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