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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b19f68b612c4d56dfcf6f1b6e4ae3a27b8cfb64fd7fa435a4955a7c906ac4a' 
  AND token = 'eNheH4BuP/hSuVKf+CcU5IKaMViYd1X77N76Y85E+jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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