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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd927d0da8d4b90d568596f25726da9f767a1586b7cae2f03b9ba2032e65091e2' 
  AND token = 'EaSo9BDCFgAuPzz5mCMLAenF68kAIGgZYhq5J6r9iyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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