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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66d3020dd7100b64f9ed8b7620442d13b6b5fb3f0767de131a83c995c67e610' 
  AND token = '94BpIi+D7tf5drohzng7g4VzyO+eeAW+MiKpPg/M424=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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