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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9dbfc9787adebbb795958bf0446b7f696d6b203197d8d6ca69066863057a2ed' 
  AND token = 'acJOgMBd4gr2BZFmiYvV/Cmtm231DjWbIWkdo7wZkJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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