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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91abf43f5c5cfbf964a28af257dd6a171991c3fb95cfaf0614d6fe7f2b6cd26' 
  AND token = 'DyInSqmfj93f1pJyr9W8/SSNL/ugvR/3ukh67Gm4imo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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