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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda0986edc8c29fed63dd606f9ceb7c379d833d13c80f78c560a53bae482717a' 
  AND token = 'lAEUP3BkwDjPck29eNXHTBhI0Rg078uXqvQg6g7QpBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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