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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fba8f4a784cc7952f082a342e9b9ac277c84eee25932e709fe696aa7f11262' 
  AND token = 'QG0kkrZn9CX1bO9Ei3uXIV8wDkDHnzeqyUCbCX+5UbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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