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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dba92a05b5600d538f118f5b94c884e4a3c74438c03020344b4d7d9dfb8a035' 
  AND token = 'hjGZC2obRNfdBfk5ORuKGugVCpe27MkbHkOso+WVr+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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