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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f1d647fe63e65147a22fb9a795061cac1af86711f23c6bacbaa5e6e1ab2ddc' 
  AND token = 'XbXaLzEWWCvM2+FCclwd9rd2ailtPVzFJEO3MwzPWRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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