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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1881a069ea20168da069e82ec9809673d78e86a56b37dc688fc88b2f942ff56d' 
  AND token = 'in4SD2wGmXlEQnnQ0f7QbNJrFAYmJ9LNgNJGm27/JSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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