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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ad8471e15c6e586dfcd5fad1edc8f6735a67db1325f15b1dea4dec9415d255' 
  AND token = 'YM8GG5Fnh7am7FvpGKNpxm8wfABGAwxVINE1skLIdr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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