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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78bf58fac3c88135a744ee2592f8f6f2dd34c9e7630b56960b1ad304b5b579fd' 
  AND token = 'm8iZ8Gz1xgDaTKttz945X69Jym41FYcGKG9tOeiMVjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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